Fair Value Measurements (Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Assets:
Cash equivalents	$ 721	$ 297
Other investments	114	118
Liabilities:
Forward contracts	53	53
Level 1
Assets:
Cash equivalents	721	297
Other investments	114	118
Liabilities:
Forward contracts	0	0
Level 2
Assets:
Cash equivalents	0	0
Other investments	0	0
Liabilities:
Forward contracts	53	53
Level 3
Assets:
Cash equivalents	0	0
Other investments	0	0
Liabilities:
Forward contracts	$ 0	$ 0